Question

Difference between gross calorific value and physiological value

Answer 1

GROSS CALORIFIC VALUE:
The heat produced by the combustion of unit quantity of a fuel when burned at constant volume in an oxygen bomb calorimeter.

PHYSIOLOGICAL VALUE:
The amount of energy available to the body after burning of a fuel is termed as Physiological value.

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Answer 2

Difference between gross calorific value and physiological value

Explanation:

• Calorific value of a substance tells us the total amount of heat energy released after combustion of said amount that substance (fuel) say 1 Kg. This amount of heat released is particular or constant for a substance. It is expressed in terms of kilo joules per Kg (KJ/Kg).

• The measurement of amount of energy available to the body after burning of a fuel (food) is termed as physiological fuel value. This is because body does not completely absorb and metabolize ingested nutrients. The energy lost in excreta, respiration etc.  must be subtracted from  total energy value (Calorific value) of the food to obtain amount of energy available to body (physiological fuel value) from consumption of the food.

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